Magnetic ore-separator



(No Model.) 4 Sheets-Sheet 1.

O.'T. THOMPSON 8: R. H. SANDERS.

MAGNETIC ORE SBPARATOR.

Patented Mar. 8, .1892.

INVENTORS 2 n1: mmms Pmlrs ca, WASHIQVDTON. o. c

4 Sheets-Sheet '2.

(No Model.)

O. T. THOMPSON 81; R. HQ SANDERS. MAGNETIC ORE SEPARATOR.-

Patented Mar. 8, 1892.

- 'INVENI'QRfi (3.27M mail-W (No Model.)

4Sheets+$heet 3. (LT. THOMPSON & R. H. SANDERS.

MAGNETIC ORE SEPARATOB. I

P ted Mar. 8, 189.2;

INVENTOR S 5. V

(No Model.) 4Sheets-Sheet 4.

G. T. THOMPSON & R, H. SANDERS.

MAGNETIC ORE SE'PARATOR.

No. 470,456. Patented Ma. 1 ".,8, 1892.

L @M M 7 C.

cov, wAsmnaruN, v. c.

' .SON and RICHARD. H. SANDERS, both of Phila.

ouAuLns 'r. THOMPSON AND RICHARD H. SANDERS,'OF PHILADELPHIA,

PENNSYLVANIA.

BATENT omen,

MAG u ETlG on E-SEPARATO R.

SPECIFICATION forming part-of Letters Patent No. 470,456, dated March 8, 1892. Application filed December 5, 1891. Serial No, 414,137. (No model.)

To all whom it may concern.-

Be it known that we, CHARLES T. Tno urdelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Magnetic Separators for Ore and Similar Material, whereof the following is a specification, reference being had to the accompanying drawings.

In said drawings, Figure 1 represents an end elevation of the separator; Fig. 2, a front View thereof; Fig. 3, a longitudinal vertical section on the lines a; a a m and Fig. 4 is a diagrams matic View illustrating the arrangement of the electro-magnets.

Our present invention is an improvement upon theapparatus specified in our application filed April 16, 1891, Serial No. 389,166,

7 The general description of the separator to which our present invention applies, and which is broadly claimed in our said applica tion is-as follows: A hollow rotatable drum is combined with a stationary magnet placed exterior thereto and having poles which closely embrace a portion of 'the exterior periphery thereof, the Wall or shell of the drum being of such character and the magnet of such energy as to insure the projection of a magnetic field into a portion of the interior of the drum, Stationary discharge-chutes are arranged within the drum beneath the,

- upper limit of the magnetic field and lead from different parts thereof to points exiterior to the drum. The material to be treated is fed in atone end of the drum and caused to travel, preferably by gravity, toward the other end as the drum rotates. During such travel those portions of the ore or other ma terial which are susceptible to magnet1c'ac-' tion are attracted outward toward thernagnetic poles, andare thereby held against the inner surface of the drum, rising with it in rotation until they reach the upper limit of the magnetic field, which overhangs the chutes. As soon as that portion of the drum against which they have been held moves past said limit, they drop ofi from the inner surface of the shell into the chutes and are removed, preferably by gravity, to any desired receptacles.

The present improvements relate to the construction and arrangement of the magnets which are combined with the drum.

In the drawings, A represents a rctangu lar frame-work, preferably inclined or tilted as a whole upon its supports B.

i 0 represents the separating-drum, rotatably mounted within the frame in the following manner: Around the periphery of the drum at one end is a projecting annular flange I), having half-shrouded radial teeth at, which engage with the similarly half-shrouded teeth of a pinion D, mounted upon the drivingshaft F. Guide-rollers E, mounted upon the frame A and having peripheral grooves adapted to receive the projecting portions of the teeth d, are arranged in contact with the flange D at diametrical points, as shown particularly in Fig, 1. At the other end of the drum an annular flange 0 extends around the periphery and is received and guided by means of the 'iianged rollers E E E The drum is thus freely supported for rotation; but endwise movement is prevented by the engagement of the grooved rollers with the flange o and the toothed portion of the flange D. An inlet-chute M for the ore or other material leads into the upper or receiving end of the drum. The wall or shell of the drum should of course be of such. a character as not to substantially interfere with the formation of a magnetic field throughouta portion of its interior by the stationary exterior magnet; l Ve prefer to employ non-magnetizable material-such as wood or brass-for the purpose, because we are thereby enabled to use a magnet of less energy than where the wall is of magnetizalole material; but We do not limit ourselves to the use of any particular material, it being only necessary that the magnet shculdbe of sufticientenergy to project a substantial nu'nn ber of lines of force through the wall and thus form an efficient field within the drum When, therefore, we use in our claim the term substantially non-interfering to de scribe the nature of this Wall, we do not there= by prescribe the particular material of which the drum is to be constructed, but mean that itis of such character with reference to the energy of the exterior magnet as to be incatoo - group, and N; the fifth group, or the one most vided into four groups, those upon the plate .right in Fig.1, and which for convenience we and g pable of retaining within itself or cutting oiif the whole of the lines of force which that magnet is capable of projecting.

Along that side of the drum which is to the term the front, are grouped the stationary electro-magnets, whose fields embrace, pref-- erably, a semicircle of a vertical diameter.

These magnets in the instance shown are three in number and each of them consists of 'a pair of parallel U-shaped plates with their inner edges facing the exterior of the drum,

their entire outer edges being backed and connected by means of a flat U-shaped band,

so that the cross-section of the plates and the connecting-band is also U shaped.

In Fig. 3, L represents the backing or connecting band, and T t the plates at that magnet which is nearest to the receiving end of the separator, and which we term the first magnet. L represents the band, and T t the plates, of thecent'ral magnet, and L T and t represent, respectively, the band and the plates, of the magnet which is nearest to' the discharging end, which we term the last magnet. The three magnets are held in position by bolts 0., a and a which pass through the transverse strips A, A and A respectively, and are secured to the bands L, L, and L of the respectivema-gnets. The energizing coils of-these magnets are wrapped around each of the plates lengthwise and follow the U-shaped contour thereof, exposing only the inner edge of the plate. Each magnet is therefore a shallow but very wide horseshoe, whose respective poles are U-shaped', extending the whole length of the inner edge of each plate.

To permit of variation in the energy of the different magnets, for the purposes which will be hereinafter described, we divide the coils of the first magnet into five groups, as shown in the diagrammatic view of Fig. 4, where N represents that group which is nearest to the pole or inner edge of the plate '1; N, the next group; N the third group; N, the fourth remote from that pole. The other plate or leg t of the magnet is provided with similar groups n n, n", n", and n", which corresponds in position and number of coils Y with the respective g'roups upon the leg T. I

The coils upon the central magnet are di- T being represented by P, P, P and P respectively, while those upon the other plate 25 are represented byp, p, 10 and 19 respectively. Thelast magnet has its coils divided into three groups, those of the plate T being indicated by Q, Q, Q and Q while the corresponding ones upon the plate t are indicated by q, q,

The groups upon each magnet'are, in the instance shown, connected in series, as are also the three electro-magnets themselves, and in order to permit the throwing into or out of minals by 'u o- 41 and the switch by circuit any desired number of the groups upon the respective magnets independent terminal '1 while the main terminals thereof are indicatedv by U and U.

By means of a switch 0, adapted to with any one of the respective terminal wires of the first magnet, the circuit can be limited to any desired number of the groups upon the said magnet, since the group or groups beyond the contact-point to which the switch is applied are of course cut out.

The main terminals'of the central magnet are indicated by V V, the intermediate ter- The main terminals of thethird or last magnet are indicated by WV W, the intermediate ones by w w, and the switch by 0 The source of electricity is indicated at 0 The current may be either direct or alternatmg.

The circuit-wires are respectively indicated at 0 and O.

The capacity for variation of magnetic energy is greatest in the first magnet and least in the last magnet, the capacity of the central magnet for variation being intermediate between the two. WVe prefer, also, that when all three of the magnets are energized to their fullest extent, the last magnet should be the most powerful, the central magnet next in power, and the first magnet the one of least power.

Within the drum C are" three deliver chutes K, K, and K arranged at diiferent levels, but in line with the upper limit of the magnetic fields and leading, as shown in Fig. 3, from different longitudinal points. -The chute K extends from the receiving end of the/drum entirely. to the delivery end. The

chute K extends from a point intermediate between the first and second magnets and leads out to the delivery end, overhanging, of course, the corresponding portion of the chute .K, while the chute K extends from a point intermediate between the second and third magnets to the delivery end and overhangs a corresponding portion of the chute K. Thus the ores or other materials which drop from'the drum at the upper limit of the magnetic-fields are segregated in accordance with the field arrested by the first magnet) will be retained in the centralportion of the drum and will fall into the chute K. Tl

connect ,ldof the third magnet, which is energized to the fullest extent, should be sufficiently powerful to arrest all the remaining poorer portions of the ore and to insure their discharge into the chute K In the system illustrated in the accompanying drawings we have representedavery complete embodiment of our invention, in that the coils of each of the three magnets are divided into groups, as above described, so as to present a very wide range of possible variation; but it must be understood that we do not limit ourselves to the particular arrangement shown, since other and equivalent methods for varying the energy in the diiterent fields may be resorted to for the same purpose and with a like result-such, for instance, as employing separate sources of electricity for the three magnets and varying the currents thereof, or, in fact, employing any of the well known de- 20 vices whereby fields of different energy may be produced. Furthermore, the members of the magnets may be course be increased or diminished to give the desired number of grades.

stantially as set forth, whereby the energy of the fields of one or more of the magnets may be varied, as and for the purposes specified.

CHAS. T. THOMPSON. RICHARD H. SANDERS. Witnesses:

JAMEs H. BELL, E. REESE. 

